| Citation: | DOU Wei, LIU Xiaoyang, SUN Shengdi. Reliability fuzzy allocation of rotating machinery considering failure correlation[J]. Journal of Aerospace Power, 2025, 40（9）：20240235 doi: 10.13224/j.cnki.jasp.20240235
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In the reliability design process of rotating machinery, the assumption of failure independence between different components may lead to unsatisfactory results in reliability allocation. Therefore, a reliability allocation method based on failure correlation and fuzzy analytic hierarchy process (FAHP) was proposed. Based on the analytic hierarchy process model and initial evaluations, a non-fuzzy evaluation matrix was constructed for all system components, aiming to reduce the subjective influence from the initial evaluations. By introducing the load dispersion coefficient, a failure correlation factor reflecting the failure correlation between components was devised to adjust the coefficients of complexity, severity, and occurrence within the evaluation matrix, and the reliability weights of components were calculated. A reliability allocation model was constructed by inputting reliability weights into the Gumbel Copula function. Taking a liquid rocket engine turbopump as an example, a comparative analysis was conducted. Since taking into account failure correlation, the proposed method can provide a more reasonable and lower cost reliability allocation scheme, where the turbine and shell with higher failure hazard were reasonably allocated higher reliability indexes of
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